. >>> at the white house last night, after the capture, president obama applauded law enforcement officials, but said there's more work to do in the coming investigation. >> obviously tonight there's still many unanswered questions. among them -- why did young men who grew up and studied here as part of our communities and our country resort to such violence? how did they plan and carry out these attacks, and did they receive any help. the families of those killed so senselessly deserve answers. the wounded, some of whom now have to learn how to stand and walk and live again deserve answers. >> so many questions at this point, including what was he doing in those 20 hours or so, and what do we know about how it came to this point. ron allen is at the hospital where the 19-year-old suspect dzhokhar tsarnaev is right now. and, of course, obviously the police, the investigators, want to talk to him. what do we know about his condition, ron? >> reporter: well, chris, we believe he is in serious condition. we know he suffered a lot of loss of blood during this ordeal. we know that he was on the